Override setDrawFilter() in SkColorSpaceXformCanvas

Fixes cts tests.

b/37161109
b/37237678

Bug: skia:
Change-Id: I12d78b631b4056a78cbbb2962144e8cc62eb931a
Reviewed-on: https://skia-review.googlesource.com/13244
Commit-Queue: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>

src/core/SkColorSpaceXformCanvas.cpp

@@ -228,6 +228,13 @@ public:
         return kNoLayer_SaveLayerStrategy;
     }
 
+#ifdef SK_SUPPORT_LEGACY_DRAWFILTER
+    SkDrawFilter* setDrawFilter(SkDrawFilter* filter) override {
+        SkCanvas::setDrawFilter(filter);
+        return fTarget->setDrawFilter(filter);
+    }
+#endif
+
     // Everything from here on should be uninteresting strictly proxied state-change calls.
     void willSave()    override { fTarget->save(); }
     void willRestore() override { fTarget->restore(); }